An Improved Synthesis of 2-Nitrobenzo[<i>b</i>]furans
作者:Anne Tromelin、Pierre Demerseman、René Royer
DOI:10.1055/s-1985-31435
日期:——
2-Nitrobenzo[b]furans 4 are prepared in improved yields by reacting o-hydroxybenzaldehydes 1 and bromonitromethane (2) at low temperature in order to avoid the dehydration of the aldol intermediate 3 in the alkaline condensation medium. This aldol 3 is then quantitatively dehydrated by heating in acetic anhydride.